Formula: Cu10(Fe,Pb)S6
Reflected/transmitted colour: opaque, polished section bright cream parallel to elongation, stronger yellowish cream perpendicular, dulls on exposure
Pleochroism:
Optical isotropy/anisotropy: polished section in air strong anisotropy, //c dark gray-black, ┴ c dark yellow-brown and dark blue-green, in oil stronger anisotropic, more vivid colours
Optical sign:
Refractive indices:
Birefringence δ/bireflectance: polished section in air distinct, //c light cream, ┴ c more yellow cream, in oil stronger, the colours having a more yellow tinge
2V angle:
Dispersion:
Optical orientation:
Optical axial plane:
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